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Subject[PATCH 14/17] Unionfs: stop using iget() and read_inode()
Date
From: David Howells <dhowells@redhat.com>

Replace unionfs_read_inode() with unionfs_iget(), and call that instead of
iget(). unionfs_iget() then uses iget_locked() directly and returns a
proper error code instead of an inode in the event of an error.

unionfs_fill_super() returns any error incurred when getting the root inode
instead of EINVAL.

Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Erez Zadok <ezk@cs.sunysb.edu>
---
fs/unionfs/main.c | 11 +++++------
fs/unionfs/super.c | 19 ++++++++++++++-----
fs/unionfs/union.h | 1 +
3 files changed, 20 insertions(+), 11 deletions(-)
diff --git a/fs/unionfs/main.c b/fs/unionfs/main.c
index ba3471d..4bc2c66 100644
--- a/fs/unionfs/main.c
+++ b/fs/unionfs/main.c
@@ -104,9 +104,8 @@ struct dentry *unionfs_interpose(struct dentry *dentry, struct super_block *sb,
BUG_ON(is_negative_dentry);

/*
- * We allocate our new inode below, by calling iget.
- * iget will call our read_inode which will initialize some
- * of the new inode's fields
+ * We allocate our new inode below by calling unionfs_iget,
+ * which will initialize some of the new inode's fields
*/

/*
@@ -128,9 +127,9 @@ struct dentry *unionfs_interpose(struct dentry *dentry, struct super_block *sb,
}
} else {
/* get unique inode number for unionfs */
- inode = iget(sb, iunique(sb, UNIONFS_ROOT_INO));
- if (!inode) {
- err = -EACCES;
+ inode = unionfs_iget(sb, iunique(sb, UNIONFS_ROOT_INO));
+ if (IS_ERR(inode)) {
+ err = PTR_ERR(inode);
goto out;
}
if (atomic_read(&inode->i_count) > 1)
diff --git a/fs/unionfs/super.c b/fs/unionfs/super.c
index 175840f..b71fc2a 100644
--- a/fs/unionfs/super.c
+++ b/fs/unionfs/super.c
@@ -24,11 +24,19 @@
*/
static struct kmem_cache *unionfs_inode_cachep;

-static void unionfs_read_inode(struct inode *inode)
+struct inode *unionfs_iget(struct super_block *sb, unsigned long ino)
{
int size;
- struct unionfs_inode_info *info = UNIONFS_I(inode);
+ struct unionfs_inode_info *info;
+ struct inode *inode;

+ inode = iget_locked(sb, ino);
+ if (!inode)
+ return ERR_PTR(-ENOMEM);
+ if (!(inode->i_state & I_NEW))
+ return inode;
+
+ info = UNIONFS_I(inode);
memset(info, 0, offsetof(struct unionfs_inode_info, vfs_inode));
info->bstart = -1;
info->bend = -1;
@@ -44,7 +52,8 @@ static void unionfs_read_inode(struct inode *inode)
if (unlikely(!info->lower_inodes)) {
printk(KERN_CRIT "unionfs: no kernel memory when allocating "
"lower-pointer array!\n");
- BUG();
+ iget_failed(inode);
+ return ERR_PTR(-ENOMEM);
}

inode->i_version++;
@@ -60,7 +69,8 @@ static void unionfs_read_inode(struct inode *inode)
inode->i_atime.tv_sec = inode->i_atime.tv_nsec = 0;
inode->i_mtime.tv_sec = inode->i_mtime.tv_nsec = 0;
inode->i_ctime.tv_sec = inode->i_ctime.tv_nsec = 0;
-
+ unlock_new_inode(inode);
+ return inode;
}

/*
@@ -1025,7 +1035,6 @@ out:
}

struct super_operations unionfs_sops = {
- .read_inode = unionfs_read_inode,
.delete_inode = unionfs_delete_inode,
.put_super = unionfs_put_super,
.statfs = unionfs_statfs,
diff --git a/fs/unionfs/union.h b/fs/unionfs/union.h
index 1bf0c09..533806c 100644
--- a/fs/unionfs/union.h
+++ b/fs/unionfs/union.h
@@ -364,6 +364,7 @@ extern int unionfs_fsync(struct file *file, struct dentry *dentry,
extern int unionfs_fasync(int fd, struct file *file, int flag);

/* Inode operations */
+extern struct inode *unionfs_iget(struct super_block *sb, unsigned long ino);
extern int unionfs_rename(struct inode *old_dir, struct dentry *old_dentry,
struct inode *new_dir, struct dentry *new_dentry);
extern int unionfs_unlink(struct inode *dir, struct dentry *dentry);
--
1.5.2.2


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